Why can I not get high magnification photos through my 8 inch Dobsonian?
Hi,
A Newtonian telescope mounted on a Dobson mount, is just not capable of the sort of photography you are trying to so, for reasons explained in a previous post. Before the Dobson alt/az mount became popular, anyone interested in astrophotography started with an equatorially mounted telescope.
As far as increasing your magnification goes, use a decent Barlow telenegative lens in conjunction with an eyepiece, This will put to focus well into your focuser travel, a 2x Barlow lens will increase the magnification range of all your eyepieces.
Clear skies...
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